RE: fractional gigabit ethernet links?

["Phil Rosenthal" <pr () isprime com>]

This may sound a bit ridiculous, but say the timer is every 0.25ms.
100kbit per 0.25ms = 400,000kbit or 400 mbit.
It is remotely possible to hit a 300 mbit limit with only 100kbits of
traffic, if the timer is sufficiently short, and your traffic is
sufficiently bursty.

Unless your traffic is Mcast, I doubt that issue is related.

Can you ask your provider how exactly they are limiting the pipe?  When
dealing with 300 or so megs, I doubt they will be shaping with a policy
friendly to you, as the logistics of doing so are a bit difficult.


--Phil

-----Original Message-----
From: owner-nanog () merit edu [mailto:owner-nanog () merit edu] On Behalf Of
Alex Rubenstein
Sent: Monday, July 15, 2002 11:06 PM
To: Phil Rosenthal
Cc: nanog () merit edu
Subject: RE: fractional gigabit ethernet links?






On Mon, 15 Jul 2002, Phil Rosenthal wrote:

> Hello Alex,
>
> I'd say this sounds obvious, but may be deceptively so...
> If you are taking a pipe capable of 1000 mbit, and rate-limiting it to

> 311 mbit, the logic used may be:
>
> In the last 1000 msec have there been more than 311mbits?  If yes: 
> drop.

Except, we're at the levels of 100 kbit/second in our tests.

I did just find CSCdr94172, which might be related.




-- Alex Rubenstein, AR97, K2AHR, alex () nac net, latency, Al Reuben --
--    Net Access Corporation, 800-NET-ME-36, http://www.nac.net   --